Best-Selling Author, Leonardo da Vinci (2017), The Innovators: How a Group of Hackers, Geniuses and Geeks Created the Digital Revolution (2014) and Steve Jobs (2011); Acclaimed Historian and Journalist; President and CEO of The Aspen Institute

President, The Rockefeller Foundation; Administrator, United States Agency for International Development (2010-2015); Under Secretary of Agriculture for Research, Education and Economics and Chief Scientist, United States Department of Agriculture (2009-2010); Bill & Melinda Gates Foundation (2001-2009)